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chr7    151046672
chr7    151047369
chr3    127680920
chr3    127680920

chr1    66953622    66953654
chr1    67200451    67200472
...
chr7    151047369    127680920
chr3    127680920    151046672
chr3    127680920    151047369

#!/usr/bin/perl
use warnings; 
...
}